题目

观察下列几个装置示意图，有关叙述正确的是 A．装置①中阳极上析出红色固体 B．装置②的待镀铁制品应与电源负极相连 C．装置③中外电路电子由b极流向a极 D．装置④的离子交换膜允许阳离子、阴离子、水分子自由通过 答案：B阅读理解。     In many countries today, laws protect wildlife. In India the need for such protection was realized centuries ago.      About 300 BC, an Indian writer described forests that were somewhat like national parks today. The killing of game animals was carefully governed. Some animals were fully protected. Within the forest, nobody was allowed to cut trees, burn woods, or trap animals for their furs. Animals that became dangerous to human visitors were trapped or killed outside the park so that other animals would not become uneasy.      The need for wildlife protection is greater now than ever before. About a thousand sorts of animals are in danger of extinction, and the speed at which they are being destroyed has been putting on. With mammals, forexample, the speed of extinction is now about one sort every year; from AD l to 1800, the speed was about onesort every fifty years. Everywhere, men are trying to solve the problem of saving wildlife while caring for theworld's growing population. 1. This report says that the need for protecting wildlife _____. [     ]A. was understood centuries before this time B. was described by an Indian writer about 300 years ago C. is met in many countries todayD. is carried out in forests as well as in national parks 2. The report says that in Indian forests of long ago _____. [     ]A. hunters were given permits to hunt gameB. only dangerous animals were to be killedC. the killing of game animals was controlled D. no killing of animals was allowed 3. According to the report, men trying to save wildlife are thinking about _____ as well. [     ]A. the animals in national parks B. stricter laws against hunting C. the trees in the forests D. the needs of people 4. From the report we can learn _____. [     ]A. the growth of the world's population has meant greater danger to wildlife B. about a thousand sorts of mammals are in danger of extinction C. the speed of extinction of' mammals is lower now than it was from AD l to 1800 D. hunters who kill endangered sorts of animals are seriously punished by law 5. The word "extinction" in this report most properly means _____.   [     ]A. falling down B. dying out C. growing up D. going away